In a previous blog I configured and HSRP pair using an entirely IPv6-oriented topology. I demonstrated the lightning quick failover that can be achieved with carefully crafted timers. However, a careful reader might have noticed that I didn’t consider the path BACK to my source of origin in my topology. So let’s address that today. … Continue reading Using Cisco’s EEM for path selection in IPv6 networks
Have you ever wanted to make your router dance on the head of a pin? Neither have I. But that doesn’t mean I don’t want to modify its default behavior from time to time either. Since routers already have a default route selection process, we do well to understand it so we can manipulate it … Continue reading Understanding the DISTANCE command on Cisco Routers
If you were to ask a number of networking professionals how routers make forwarding decisions, you might hear one answer far more than any other – Administrative Distance. In simplest terms, Administrative Distance (AD) is a ranking of believability. That is, if I am a router with more than one routing protocol running, to whom … Continue reading To Cisco Routers, This Concept Is Number One!